Plant-available water, stem diameter variations, chlorophyll fluorescence, and ion content in Pistacia lentiscus under salinity stress

Keywords: hydraulic conductivity, Mediterranean shrub, nutrient content, water relations

Abstract

The aim of this study was to investigate the physiological and hydric adaptability of Pistacia lentiscus (lentisco) to saline irrigation conditions. Plants of lentisco were subjected to four salinity treatments in the irrigation water (0, 50, 100 y 150 mM NaCl) during three months in a growth chamber in order to identify possible tolerance mechanisms to salinity stress. The results showed a reduction of aerial growth parameters, mainly in the 150 mM of NaCl treatment. The root biomass did not change; however, the root hydraulic conductivity was modif ied. This behavior was related with decreases in leaf water potential values both at morning and midday. With the increase of salinity in the irrigation water, the radial growth of stem of the plants was proportionally decreased, and Cl- and Na+ content at minimum and maximum illumination in leaves and roots increased. Stomatal conductance decreased in the plants with higher salinity level, although chlorophyll content and fluorescence were not affected by the salinity treatments. Although the growth rates were statistically affected in all the treatments, the plants were able to resist the salt stress through changes in the leaf structures, related to a reduction of water losses via transpiration.

Author Biographies

Marco Antonio Castillo-Campohermoso, Centro de Investigación en Química Aplicada

Investigador Asociado C. Departamento de Biociencias y Agrotecnología

Fernando Broetto, Universidad Estatal Paulista- UNESP

Profesor-Investigador. Departamento de Química y Bioquímica.

Ana Margarita Rodríguez-Hernández, Centro de Investigación en Química Aplicada
Investigador Asociado C. Departamento de Biociencias y Agrotecnología
Lluvia de Abril Alexandra Soriano-Melgar, Centro de Investigación en Química Aplicada
Catedrática CONACyT adscrita el Departamento de Biociencias y Agrotecnología.
Oussama Mounzer, Centro de Investigación en Química Aplicada.
Investigador Titular A. Departamento de Biociencias y Agrotecnología
María Jesús Sánchez-Blanco, Centro de edafología y biología aplicada del segura CEBAS -CSIC

Investigador científico. Departamento de Riego.

Published
2020-01-31
Section
Scientific Papers